<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="upload"
        >
        <div
          class="drop"
          :class="{active: isIn}"
          @dragenter="dragenter"
          @dragover="dragover"
          @drop="drop"
          @dragleave="dragleave"
        >
          <i class="el-icon-upload" />
          <el-button
            type="text"
            @click="downloadTemplate"
          >下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="handleClick">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button
        size="mini"
        type="primary"
        @click="$emit('update:showExcelDialog', false)"
      >取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import { saveAs } from 'file-saver'
import { reqExcelTemplate, reqImportExcel } from '@/api/employee'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      isIn: false
    }
  },
  methods: {
    //  下载模板
    async downloadTemplate() {
      const blob = await reqExcelTemplate()
      console.log(blob)
      saveAs(blob, '员工导入模板.xlsx')
    },
    // 为按钮绑定点击事件触发文件域的点击事件
    handleClick() {
      this.$refs['excel-upload-input'].click()
    },
    // 文件域的change事件 做 上传操作
    upload(e) {
      //   1、非空判断
      if (!e.target.files[0]) return
      //    2、记录上传的文件
      const file = e.target.files[0]
      this.sendFile(file)
    },
    async sendFile(file) {
      //   3、处理formData类型
      const fm = new FormData()
      fm.append('file', file)
      //   4、发送请求
      try {
        await reqImportExcel(fm)
        // 5、关闭对话框
        this.$emit('update:showExcelDialog', false)
        // 6、重新渲染
        this.$emit('reload')
      } finally {
        // 7、清空文件域的value(解决选择同一个文件不会触发change的问题)
        this.$refs['excel-upload-input'].val = null
      }
    },
    dragleave(e) {
      e.preventDefault()
      e.stopPropagation()
      console.log('拖拽离开了')
      this.isIn = false
    },
    dragenter(e) {
      e.preventDefault()
      e.stopPropagation()
      console.log('拖拽进入了')
      this.isIn = true
    },
    dragover(e) {
      e.preventDefault()
      e.stopPropagation()
      console.log('dragover 持续触发')
    },
    // 拖拽进入
    drop(e) {
      e.preventDefault()
      e.stopPropagation()
      console.log(e)
      //   this.sendFile(file)
      this.sendFile(e.dataTransfer.files[0])
    }
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
  margin: 20px;
  width: 360px;
  height: 180px;
  align-items: center;
  color: #697086;
  .excel-upload-input {
    display: none;
    z-index: -9999;
  }
  .btn-upload,
  .drop {
    border: 1px dashed #dcdfe6;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 160px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .drop {
    line-height: 40px;
    color: #bbb;
    i {
      font-size: 60px;
      display: block;
      color: #c0c4cc;
    }
  }
   .active {
      border-color: aqua !important;
    }
}
</style>
